为 RepoForm 添加出售功能，ShopNode 只承载玩家购买组件的逻辑

Assets/GameMain/Scripts/CustomComponent/InventoryGeneration/ShopGoodsBuilder.cs

@@ -123,18 +123,7 @@ namespace GeometryTD.CustomComponent
 
         private int ResolveRandomPrice(RarityType rarity, Random random)
         {
-            for (int i = 0; i < _shopPriceRows.Count; i++)
+            return ShopPriceRuleService.ResolveRandomBuyPrice(_shopPriceRows, rarity, random);
-            {
-                DRShopPrice row = _shopPriceRows[i];
-                if (row != null && row.Rarity == rarity)
-                {
-                    int min = Mathf.Max(0, row.MinPrice);
-                    int max = Mathf.Max(min, row.MaxPrice);
-                    return random.Next(min, max + 1);
-                }
-            }
-
-            return 0;
         }
 
         private static IconAreaContext BuildIconAreaContext(TowerCompItemData item)

Assets/GameMain/Scripts/CustomComponent/PlayerInventory/PlayerInventoryComponent.cs

@@ -14,6 +14,7 @@ namespace GeometryTD.CustomComponent
         private PlayerInventoryCommandModel _commandModel;
         private PlayerInventoryTowerRosterService _towerRosterService;
         private PlayerInventoryTowerAssemblyService _towerAssemblyService;
+        private PlayerInventoryTradeService _tradeService;
 
         public int Gold
         {
@@ -100,6 +101,12 @@ namespace GeometryTD.CustomComponent
             return _commandModel.TryConsumeGold(costGold);
         }
 
+        public bool TryPurchaseComponent(TowerCompItemData item, int price)
+        {
+            EnsureInitialized();
+            return _tradeService.TryPurchaseComponent(item, price);
+        }
+
         public void AddGold(int gainGold)
         {
             EnsureInitialized();
@@ -138,6 +145,18 @@ namespace GeometryTD.CustomComponent
             return _towerRosterService.ReduceTowerEndurance(towerInstanceIds, enduranceLoss);
         }
 
+        public bool TryGetSaleCandidate(long itemId, out PlayerInventorySaleCandidate candidate)
+        {
+            EnsureInitialized();
+            return _tradeService.TryGetSaleCandidate(itemId, out candidate);
+        }
+
+        public bool TrySellItems(IReadOnlyCollection<long> itemIds, out PlayerInventorySaleResult result)
+        {
+            EnsureInitialized();
+            return _tradeService.TrySellItems(itemIds, out result);
+        }
+
         private void EnsureInitialized()
         {
             if (_queryModel.IsInitialized)
@@ -155,6 +174,7 @@ namespace GeometryTD.CustomComponent
             _commandModel ??= new PlayerInventoryCommandModel(_state);
             _towerRosterService ??= new PlayerInventoryTowerRosterService(_queryModel, MaxParticipantTowerCount);
             _towerAssemblyService ??= new PlayerInventoryTowerAssemblyService(_queryModel, _commandModel);
+            _tradeService ??= new PlayerInventoryTradeService(_queryModel, _commandModel);
         }
     }
 }

Assets/GameMain/Scripts/CustomComponent/PlayerInventory/PlayerInventoryTradeService.cs

@@ -0,0 +1,400 @@
+using System.Collections.Generic;
+using GameFramework.DataTable;
+using GeometryTD.CustomUtility;
+using GeometryTD.DataTable;
+using GeometryTD.Definition;
+using UnityEngine;
+
+namespace GeometryTD.CustomComponent
+{
+    public enum PlayerInventorySaleFailureReason : byte
+    {
+        None = 0,
+        InvalidSelection = 1,
+        ItemNotFound = 2,
+        AssembledComponent = 3,
+        ParticipantTower = 4,
+        MissingTowerComponent = 5
+    }
+
+    public sealed class PlayerInventorySaleCandidate
+    {
+        public long ItemId;
+        public bool IsSellable;
+        public bool IsTower;
+        public int Price;
+        public PlayerInventorySaleFailureReason FailureReason;
+    }
+
+    public sealed class PlayerInventorySaleResult
+    {
+        public int GainedGold;
+        public int SoldComponentCount;
+        public int SoldTowerCount;
+        public PlayerInventorySaleFailureReason FailureReason;
+
+        public bool IsSuccess => FailureReason == PlayerInventorySaleFailureReason.None;
+        public int SoldItemCount => SoldComponentCount + SoldTowerCount;
+    }
+
+    public sealed class PlayerInventoryTradeService
+    {
+        private readonly PlayerInventoryQueryModel _queryModel;
+        private readonly PlayerInventoryCommandModel _commandModel;
+        private IDataTable<DRShopPrice> _shopPriceTable;
+
+        public PlayerInventoryTradeService(
+            PlayerInventoryQueryModel queryModel,
+            PlayerInventoryCommandModel commandModel,
+            IDataTable<DRShopPrice> shopPriceTable = null)
+        {
+            _queryModel = queryModel;
+            _commandModel = commandModel;
+            _shopPriceTable = shopPriceTable;
+        }
+
+        public bool TryPurchaseComponent(TowerCompItemData item, int price)
+        {
+            if (item == null)
+            {
+                return false;
+            }
+
+            if (!_commandModel.TryConsumeGold(price))
+            {
+                return false;
+            }
+
+            BackpackInventoryData inventoryDelta = WrapSingleItem(item);
+            PlayerInventoryMergeSummary summary = _commandModel.MergeInventory(inventoryDelta);
+            return summary.HasAnyGain;
+        }
+
+        public bool TryGetSaleCandidate(long itemId, out PlayerInventorySaleCandidate candidate)
+        {
+            candidate = BuildSaleCandidate(itemId);
+            return candidate != null;
+        }
+
+        public bool TrySellItems(IReadOnlyCollection<long> itemIds, out PlayerInventorySaleResult result)
+        {
+            result = new PlayerInventorySaleResult();
+            if (itemIds == null || itemIds.Count <= 0)
+            {
+                result.FailureReason = PlayerInventorySaleFailureReason.InvalidSelection;
+                return false;
+            }
+
+            HashSet<long> uniqueIds = new HashSet<long>();
+            List<PlayerInventorySaleCandidate> candidates = new List<PlayerInventorySaleCandidate>(itemIds.Count);
+            foreach (long itemId in itemIds)
+            {
+                if (itemId <= 0 || !uniqueIds.Add(itemId))
+                {
+                    continue;
+                }
+
+                PlayerInventorySaleCandidate candidate = BuildSaleCandidate(itemId);
+                if (candidate == null || !candidate.IsSellable)
+                {
+                    result.FailureReason = candidate?.FailureReason ?? PlayerInventorySaleFailureReason.ItemNotFound;
+                    return false;
+                }
+
+                candidates.Add(candidate);
+            }
+
+            if (candidates.Count <= 0)
+            {
+                result.FailureReason = PlayerInventorySaleFailureReason.InvalidSelection;
+                return false;
+            }
+
+            BackpackInventoryData inventory = _queryModel.Inventory;
+            for (int i = 0; i < candidates.Count; i++)
+            {
+                PlayerInventorySaleCandidate candidate = candidates[i];
+                if (candidate.IsTower)
+                {
+                    if (!TryRemoveTower(inventory, candidate.ItemId))
+                    {
+                        result.FailureReason = PlayerInventorySaleFailureReason.MissingTowerComponent;
+                        return false;
+                    }
+
+                    result.SoldTowerCount++;
+                }
+                else
+                {
+                    if (!TryRemoveComponent(inventory, candidate.ItemId))
+                    {
+                        result.FailureReason = PlayerInventorySaleFailureReason.ItemNotFound;
+                        return false;
+                    }
+
+                    result.SoldComponentCount++;
+                }
+
+                result.GainedGold += Mathf.Max(0, candidate.Price);
+            }
+
+            _commandModel.AddGold(result.GainedGold);
+            result.FailureReason = PlayerInventorySaleFailureReason.None;
+            return true;
+        }
+
+        private PlayerInventorySaleCandidate BuildSaleCandidate(long itemId)
+        {
+            if (itemId <= 0)
+            {
+                return new PlayerInventorySaleCandidate
+                {
+                    ItemId = itemId,
+                    IsSellable = false,
+                    FailureReason = PlayerInventorySaleFailureReason.InvalidSelection
+                };
+            }
+
+            BackpackInventoryData inventory = _queryModel.Inventory;
+            if (inventory == null)
+            {
+                return new PlayerInventorySaleCandidate
+                {
+                    ItemId = itemId,
+                    IsSellable = false,
+                    FailureReason = PlayerInventorySaleFailureReason.ItemNotFound
+                };
+            }
+
+            if (_queryModel.TryGetTowerById(itemId, out TowerItemData tower) && tower != null)
+            {
+                if (inventory.ParticipantTowerInstanceIds != null && inventory.ParticipantTowerInstanceIds.Contains(itemId))
+                {
+                    return new PlayerInventorySaleCandidate
+                    {
+                        ItemId = itemId,
+                        IsSellable = false,
+                        IsTower = true,
+                        FailureReason = PlayerInventorySaleFailureReason.ParticipantTower
+                    };
+                }
+
+                if (!ShopPriceRuleService.TryResolveTowerSalePrice(tower, inventory, out int towerPrice, EnsureShopPriceTable()))
+                {
+                    return new PlayerInventorySaleCandidate
+                    {
+                        ItemId = itemId,
+                        IsSellable = false,
+                        IsTower = true,
+                        FailureReason = PlayerInventorySaleFailureReason.MissingTowerComponent
+                    };
+                }
+
+                return new PlayerInventorySaleCandidate
+                {
+                    ItemId = itemId,
+                    IsSellable = true,
+                    IsTower = true,
+                    Price = towerPrice,
+                    FailureReason = PlayerInventorySaleFailureReason.None
+                };
+            }
+
+            if (TryGetComponentById(inventory.MuzzleComponents, itemId, out MuzzleCompItemData muzzleComp))
+            {
+                return BuildComponentCandidate(muzzleComp);
+            }
+
+            if (TryGetComponentById(inventory.BearingComponents, itemId, out BearingCompItemData bearingComp))
+            {
+                return BuildComponentCandidate(bearingComp);
+            }
+
+            if (TryGetComponentById(inventory.BaseComponents, itemId, out BaseCompItemData baseComp))
+            {
+                return BuildComponentCandidate(baseComp);
+            }
+
+            return new PlayerInventorySaleCandidate
+            {
+                ItemId = itemId,
+                IsSellable = false,
+                FailureReason = PlayerInventorySaleFailureReason.ItemNotFound
+            };
+        }
+
+        private PlayerInventorySaleCandidate BuildComponentCandidate(TowerCompItemData component)
+        {
+            if (component == null)
+            {
+                return new PlayerInventorySaleCandidate
+                {
+                    IsSellable = false,
+                    FailureReason = PlayerInventorySaleFailureReason.ItemNotFound
+                };
+            }
+
+            if (component.IsAssembledIntoTower)
+            {
+                return new PlayerInventorySaleCandidate
+                {
+                    ItemId = component.InstanceId,
+                    IsSellable = false,
+                    FailureReason = PlayerInventorySaleFailureReason.AssembledComponent
+                };
+            }
+
+            return new PlayerInventorySaleCandidate
+            {
+                ItemId = component.InstanceId,
+                IsSellable = true,
+                IsTower = false,
+                Price = ShopPriceRuleService.ResolveComponentSalePrice(component, EnsureShopPriceTable()),
+                FailureReason = PlayerInventorySaleFailureReason.None
+            };
+        }
+
+        private bool TryRemoveTower(BackpackInventoryData inventory, long towerId)
+        {
+            if (inventory?.Towers == null || towerId <= 0)
+            {
+                return false;
+            }
+
+            TowerItemData targetTower = null;
+            for (int i = 0; i < inventory.Towers.Count; i++)
+            {
+                TowerItemData tower = inventory.Towers[i];
+                if (tower != null && tower.InstanceId == towerId)
+                {
+                    targetTower = tower;
+                    break;
+                }
+            }
+
+            if (targetTower == null)
+            {
+                return false;
+            }
+
+            if (!ContainsInstanceId(inventory.MuzzleComponents, targetTower.MuzzleComponentInstanceId) ||
+                !ContainsInstanceId(inventory.BearingComponents, targetTower.BearingComponentInstanceId) ||
+                !ContainsInstanceId(inventory.BaseComponents, targetTower.BaseComponentInstanceId))
+            {
+                return false;
+            }
+
+            bool removedMuzzle = RemoveByInstanceId(inventory.MuzzleComponents, targetTower.MuzzleComponentInstanceId);
+            bool removedBearing = RemoveByInstanceId(inventory.BearingComponents, targetTower.BearingComponentInstanceId);
+            bool removedBase = RemoveByInstanceId(inventory.BaseComponents, targetTower.BaseComponentInstanceId);
+            if (!removedMuzzle || !removedBearing || !removedBase)
+            {
+                return false;
+            }
+
+            inventory.Towers.Remove(targetTower);
+            inventory.ParticipantTowerInstanceIds?.Remove(towerId);
+            return true;
+        }
+
+        private static bool TryRemoveComponent(BackpackInventoryData inventory, long itemId)
+        {
+            return RemoveByInstanceId(inventory?.MuzzleComponents, itemId) ||
+                   RemoveByInstanceId(inventory?.BearingComponents, itemId) ||
+                   RemoveByInstanceId(inventory?.BaseComponents, itemId);
+        }
+
+        private static bool RemoveByInstanceId<TItem>(List<TItem> items, long instanceId)
+            where TItem : class
+        {
+            if (items == null || instanceId <= 0)
+            {
+                return false;
+            }
+
+            for (int i = 0; i < items.Count; i++)
+            {
+                switch (items[i])
+                {
+                    case TowerCompItemData component when component.InstanceId == instanceId:
+                        items.RemoveAt(i);
+                        return true;
+                    case TowerItemData tower when tower.InstanceId == instanceId:
+                        items.RemoveAt(i);
+                        return true;
+                }
+            }
+
+            return false;
+        }
+
+        private static bool ContainsInstanceId<TItem>(IReadOnlyList<TItem> items, long instanceId)
+            where TItem : class
+        {
+            if (items == null || instanceId <= 0)
+            {
+                return false;
+            }
+
+            for (int i = 0; i < items.Count; i++)
+            {
+                switch (items[i])
+                {
+                    case TowerCompItemData component when component.InstanceId == instanceId:
+                        return true;
+                    case TowerItemData tower when tower.InstanceId == instanceId:
+                        return true;
+                }
+            }
+
+            return false;
+        }
+
+        private static bool TryGetComponentById<TComp>(IReadOnlyList<TComp> items, long instanceId, out TComp result)
+            where TComp : TowerCompItemData
+        {
+            result = null;
+            if (items == null || instanceId <= 0)
+            {
+                return false;
+            }
+
+            for (int i = 0; i < items.Count; i++)
+            {
+                TComp item = items[i];
+                if (item != null && item.InstanceId == instanceId)
+                {
+                    result = item;
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
+        private static BackpackInventoryData WrapSingleItem(TowerCompItemData item)
+        {
+            BackpackInventoryData inventory = new BackpackInventoryData();
+            switch (item)
+            {
+                case MuzzleCompItemData muzzleComp:
+                    inventory.MuzzleComponents.Add(InventoryCloneUtility.CloneMuzzleComp(muzzleComp));
+                    break;
+                case BearingCompItemData bearingComp:
+                    inventory.BearingComponents.Add(InventoryCloneUtility.CloneBearingComp(bearingComp));
+                    break;
+                case BaseCompItemData baseComp:
+                    inventory.BaseComponents.Add(InventoryCloneUtility.CloneBaseComp(baseComp));
+                    break;
+            }
+
+            return inventory;
+        }
+
+        private IDataTable<DRShopPrice> EnsureShopPriceTable()
+        {
+            _shopPriceTable ??= GameEntry.DataTable.GetDataTable<DRShopPrice>();
+            return _shopPriceTable;
+        }
+    }
+}

Assets/GameMain/Scripts/CustomComponent/PlayerInventory/PlayerInventoryTradeService.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 298cf9214556453cb5e7ec7c0605c350
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/GameMain/Scripts/Event/RepoForm/RepoSellCancelRequestedEventArgs.cs

@@ -0,0 +1,21 @@
+using GameFramework;
+using GameFramework.Event;
+
+namespace GeometryTD.CustomEvent
+{
+    public sealed class RepoSellCancelRequestedEventArgs : GameEventArgs
+    {
+        public static int EventId => typeof(RepoSellCancelRequestedEventArgs).GetHashCode();
+
+        public override int Id => EventId;
+
+        public static RepoSellCancelRequestedEventArgs Create()
+        {
+            return ReferencePool.Acquire<RepoSellCancelRequestedEventArgs>();
+        }
+
+        public override void Clear()
+        {
+        }
+    }
+}

Assets/GameMain/Scripts/Event/RepoForm/RepoSellCancelRequestedEventArgs.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 2cc34a22ea6347619b065c5874e0b715
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/GameMain/Scripts/Event/RepoForm/RepoSellConfirmRequestedEventArgs.cs

@@ -0,0 +1,21 @@
+using GameFramework;
+using GameFramework.Event;
+
+namespace GeometryTD.CustomEvent
+{
+    public sealed class RepoSellConfirmRequestedEventArgs : GameEventArgs
+    {
+        public static int EventId => typeof(RepoSellConfirmRequestedEventArgs).GetHashCode();
+
+        public override int Id => EventId;
+
+        public static RepoSellConfirmRequestedEventArgs Create()
+        {
+            return ReferencePool.Acquire<RepoSellConfirmRequestedEventArgs>();
+        }
+
+        public override void Clear()
+        {
+        }
+    }
+}

Assets/GameMain/Scripts/Event/RepoForm/RepoSellConfirmRequestedEventArgs.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 598b87b9cb8e4783bc73db5e255d31f6
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/GameMain/Scripts/Event/RepoForm/RepoSellModeToggleRequestedEventArgs.cs

@@ -0,0 +1,21 @@
+using GameFramework;
+using GameFramework.Event;
+
+namespace GeometryTD.CustomEvent
+{
+    public sealed class RepoSellModeToggleRequestedEventArgs : GameEventArgs
+    {
+        public static int EventId => typeof(RepoSellModeToggleRequestedEventArgs).GetHashCode();
+
+        public override int Id => EventId;
+
+        public static RepoSellModeToggleRequestedEventArgs Create()
+        {
+            return ReferencePool.Acquire<RepoSellModeToggleRequestedEventArgs>();
+        }
+
+        public override void Clear()
+        {
+        }
+    }
+}

Assets/GameMain/Scripts/Event/RepoForm/RepoSellModeToggleRequestedEventArgs.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 44692273ce6a417a875dea9675663d82
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/GameMain/Scripts/UI/Game/Context/RepoFormContext.cs

@@ -1,11 +1,15 @@
-using GeometryTD.UI;
-
 namespace GeometryTD.UI
 {
     public class RepoFormContext : UIContext
     {
         public string GoldText;
+        public RepoFormState State;
+        public bool ShowSellModeButton;
+        public string SellModeButtonText;
+        public bool ShowCombineArea;
+        public bool ShowSellArea;
         public CombineAreaContext CombineAreaContext;
+        public SellAreaContext SellAreaContext;
         public CompAreaContext CompAreaContext;
         public ParticipantAreaContext ParticipantAreaContext;
     }

Assets/GameMain/Scripts/UI/Game/Context/RepoFormState.cs

@@ -0,0 +1,8 @@
+namespace GeometryTD.UI
+{
+    public enum RepoFormState
+    {
+        Assemble = 0,
+        Sell = 1
+    }
+}

Assets/GameMain/Scripts/UI/Game/Context/RepoFormState.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 9110fc764f3044bda40df4a8c02f320b
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/GameMain/Scripts/UI/Game/Context/RepoItemContext.cs

@@ -11,6 +11,9 @@ namespace GeometryTD.UI
         public float EnduranceRate01;
         public RepoItemClickActionType ClickActionType;
         public TowerCompSlotType ComponentSlotType;
+        public bool IsSellMode;
+        public bool IsSellable = true;
+        public bool IsSellSelected;
         public IconAreaContext IconAreaContext;
     }
 }

Assets/GameMain/Scripts/UI/Game/Context/SellAreaContext.cs

@@ -0,0 +1,10 @@
+namespace GeometryTD.UI
+{
+    public class SellAreaContext
+    {
+        public string TotalPriceText;
+        public bool CanConfirmSell;
+        public RepoItemContext[] ComponentItems;
+        public TowerRepoItemContext[] TowerItems;
+    }
+}

Assets/GameMain/Scripts/UI/Game/Context/SellAreaContext.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: f153d1a509df4bb69c6d231df5b60db9
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/GameMain/Scripts/UI/Game/ContextBuilder/RepoFormController.ContextBuilder.cs

@@ -23,21 +23,44 @@ namespace GeometryTD.UI
             Dictionary<long, BearingCompItemData> bearingMap = BuildComponentMap(rawData.Inventory.BearingComponents);
             Dictionary<long, BaseCompItemData> baseMap = BuildComponentMap(rawData.Inventory.BaseComponents);
             Dictionary<long, TowerItemData> towerMap = BuildTowerMap(rawData.Inventory.Towers);
+            HashSet<long> selectedSellItemIds = BuildSelectedSellItemSet(rawData.SelectedSellItemIds);
+            bool isSellState = rawData.State == RepoFormState.Sell;
+
             List<RepoItemContext> componentItems = new List<RepoItemContext>();
             List<TowerRepoItemContext> towerItems = new List<TowerRepoItemContext>();
+            List<RepoItemContext> selectedSellComponentItems = new List<RepoItemContext>();
+            List<TowerRepoItemContext> selectedSellTowerItems = new List<TowerRepoItemContext>();
 
             if (rawData.Inventory.Towers != null)
             {
-                foreach (var tower in rawData.Inventory.Towers)
+                foreach (TowerItemData tower in rawData.Inventory.Towers)
                 {
                     if (tower == null)
                     {
                         continue;
                     }
 
-                    TowerRepoItemContext towerContext = BuildTowerRepoItemContext(tower, muzzleMap, bearingMap, baseMap,
+                    bool isParticipantTower = rawData.Inventory.ParticipantTowerInstanceIds != null &&
-                        RepoItemClickActionType.OpenDetail, true);
+                                             rawData.Inventory.ParticipantTowerInstanceIds.Contains(tower.InstanceId);
+                    bool isSellSelected = isSellState && selectedSellItemIds.Contains(tower.InstanceId);
+
+                    TowerRepoItemContext towerContext = BuildTowerRepoItemContext(
+                        tower,
+                        muzzleMap,
+                        bearingMap,
+                        baseMap,
+                        RepoItemClickActionType.OpenDetail,
+                        !isSellState,
+                        isSellState,
+                        !isParticipantTower,
+                        isSellSelected,
+                        false);
                     AddTowerItemContext(towerItems, towerContext);
+                    if (isSellSelected)
+                    {
+                        selectedSellTowerItems.Add(towerContext);
+                    }
+
                     AddItemDescSeed(
                         tower.InstanceId,
                         tower.Name,
@@ -50,23 +73,24 @@ namespace GeometryTD.UI
 
             if (rawData.Inventory.MuzzleComponents != null)
             {
-                foreach (var item in rawData.Inventory.MuzzleComponents)
+                foreach (MuzzleCompItemData item in rawData.Inventory.MuzzleComponents)
                 {
                     if (item == null || item.IsAssembledIntoTower)
                     {
                         continue;
                     }
 
-                    RepoItemContext componentContext = new RepoItemContext
+                    RepoItemContext componentContext = BuildSellableComponentContext(
-                    {
+                        item,
-                        InstanceId = item.InstanceId,
+                        TowerCompSlotType.Muzzle,
-                        CanDrag = true,
+                        isSellState,
-                        EnduranceRate01 = ItemDescUtility.ResolveComponentEnduranceRate(item),
+                        selectedSellItemIds.Contains(item.InstanceId));
-                        ClickActionType = RepoItemClickActionType.OpenDetail,
-                        ComponentSlotType = TowerCompSlotType.Muzzle,
-                        IconAreaContext = BuildIconAreaContext(item)
-                    };
                     AddComponentItemContext(componentItems, componentContext);
+                    if (componentContext.IsSellSelected)
+                    {
+                        selectedSellComponentItems.Add(componentContext);
+                    }
+
                     AddItemDescSeed(
                         item.InstanceId,
                         item.Name,
@@ -86,16 +110,17 @@ namespace GeometryTD.UI
                         continue;
                     }
 
-                    RepoItemContext componentContext = new RepoItemContext
+                    RepoItemContext componentContext = BuildSellableComponentContext(
-                    {
+                        item,
-                        InstanceId = item.InstanceId,
+                        TowerCompSlotType.Bearing,
-                        CanDrag = true,
+                        isSellState,
-                        EnduranceRate01 = ItemDescUtility.ResolveComponentEnduranceRate(item),
+                        selectedSellItemIds.Contains(item.InstanceId));
-                        ClickActionType = RepoItemClickActionType.OpenDetail,
-                        ComponentSlotType = TowerCompSlotType.Bearing,
-                        IconAreaContext = BuildIconAreaContext(item)
-                    };
                     AddComponentItemContext(componentItems, componentContext);
+                    if (componentContext.IsSellSelected)
+                    {
+                        selectedSellComponentItems.Add(componentContext);
+                    }
+
                     AddItemDescSeed(
                         item.InstanceId,
                         item.Name,
@@ -115,16 +140,17 @@ namespace GeometryTD.UI
                         continue;
                     }
 
-                    RepoItemContext componentContext = new RepoItemContext
+                    RepoItemContext componentContext = BuildSellableComponentContext(
-                    {
+                        item,
-                        InstanceId = item.InstanceId,
+                        TowerCompSlotType.Base,
-                        CanDrag = true,
+                        isSellState,
-                        EnduranceRate01 = ItemDescUtility.ResolveComponentEnduranceRate(item),
+                        selectedSellItemIds.Contains(item.InstanceId));
-                        ClickActionType = RepoItemClickActionType.OpenDetail,
-                        ComponentSlotType = TowerCompSlotType.Base,
-                        IconAreaContext = BuildIconAreaContext(item)
-                    };
                     AddComponentItemContext(componentItems, componentContext);
+                    if (componentContext.IsSellSelected)
+                    {
+                        selectedSellComponentItems.Add(componentContext);
+                    }
+
                     AddItemDescSeed(
                         item.InstanceId,
                         item.Name,
@@ -141,7 +167,19 @@ namespace GeometryTD.UI
             return new RepoFormContext
             {
                 GoldText = $"金币: {rawData.Inventory.Gold}",
+                State = rawData.State,
+                ShowSellModeButton = rawData.State == RepoFormState.Assemble,
+                SellModeButtonText = "出售模式",
+                ShowCombineArea = rawData.State == RepoFormState.Assemble,
+                ShowSellArea = rawData.State == RepoFormState.Sell,
                 CombineAreaContext = new CombineAreaContext(),
+                SellAreaContext = new SellAreaContext
+                {
+                    TotalPriceText = $"总价值: {rawData.SelectedSellTotalPrice}",
+                    CanConfirmSell = rawData.State == RepoFormState.Sell && rawData.SelectedSellItemCount > 0,
+                    ComponentItems = selectedSellComponentItems.ToArray(),
+                    TowerItems = selectedSellTowerItems.ToArray()
+                },
                 CompAreaContext = new CompAreaContext
                 {
                     ComponentItems = componentItems.ToArray(),
@@ -151,6 +189,26 @@ namespace GeometryTD.UI
             };
         }
 
+        private static RepoItemContext BuildSellableComponentContext(
+            TowerCompItemData item,
+            TowerCompSlotType slotType,
+            bool isSellState,
+            bool isSellSelected)
+        {
+            return new RepoItemContext
+            {
+                InstanceId = item.InstanceId,
+                CanDrag = !isSellState,
+                EnduranceRate01 = ItemDescUtility.ResolveComponentEnduranceRate(item),
+                ClickActionType = RepoItemClickActionType.OpenDetail,
+                ComponentSlotType = slotType,
+                IsSellMode = isSellState,
+                IsSellable = true,
+                IsSellSelected = isSellState && isSellSelected,
+                IconAreaContext = BuildIconAreaContext(item)
+            };
+        }
+
         private void AddComponentItemContext(List<RepoItemContext> items, RepoItemContext itemContext)
         {
             if (itemContext == null)
@@ -218,7 +276,7 @@ namespace GeometryTD.UI
                 return map;
             }
 
-            foreach (var item in items)
+            foreach (TComp item in items)
             {
                 if (item == null || item.InstanceId <= 0)
                 {
@@ -231,6 +289,26 @@ namespace GeometryTD.UI
             return map;
         }
 
+        private static HashSet<long> BuildSelectedSellItemSet(IReadOnlyList<long> selectedSellItemIds)
+        {
+            HashSet<long> selectedIds = new HashSet<long>();
+            if (selectedSellItemIds == null)
+            {
+                return selectedIds;
+            }
+
+            for (int i = 0; i < selectedSellItemIds.Count; i++)
+            {
+                long itemId = selectedSellItemIds[i];
+                if (itemId > 0)
+                {
+                    selectedIds.Add(itemId);
+                }
+            }
+
+            return selectedIds;
+        }
+
         private static Dictionary<long, TowerItemData> BuildTowerMap(IReadOnlyList<TowerItemData> towers)
         {
             Dictionary<long, TowerItemData> map = new Dictionary<long, TowerItemData>();
@@ -239,7 +317,7 @@ namespace GeometryTD.UI
                 return map;
             }
 
-            foreach (var tower in towers)
+            foreach (TowerItemData tower in towers)
             {
                 if (tower == null || tower.InstanceId <= 0)
                 {
@@ -263,7 +341,7 @@ namespace GeometryTD.UI
             List<TowerRepoItemContext> participantItems = new List<TowerRepoItemContext>();
             if (inventory?.ParticipantTowerInstanceIds != null && towerMap != null)
             {
-                foreach (var towerId in inventory.ParticipantTowerInstanceIds)
+                foreach (long towerId in inventory.ParticipantTowerInstanceIds)
                 {
                     if (towerId <= 0)
                     {
@@ -280,8 +358,17 @@ namespace GeometryTD.UI
                         continue;
                     }
 
-                    TowerRepoItemContext towerContext = BuildTowerRepoItemContext(tower, muzzleMap, bearingMap, baseMap,
+                    TowerRepoItemContext towerContext = BuildTowerRepoItemContext(
-                        RepoItemClickActionType.RemoveParticipant, false);
+                        tower,
+                        muzzleMap,
+                        bearingMap,
+                        baseMap,
+                        RepoItemClickActionType.RemoveParticipant,
+                        false,
+                        false,
+                        false,
+                        false,
+                        false);
                     if (towerContext != null)
                     {
                         participantItems.Add(towerContext);
@@ -304,6 +391,11 @@ namespace GeometryTD.UI
                 return;
             }
 
+            if (Context != null && Context.State == RepoFormState.Sell)
+            {
+                return;
+            }
+
             foreach (long towerId in _compAreaTowerIds)
             {
                 Form.SetRepoItemSelected(towerId, _participantTowerIds.Contains(towerId));
@@ -334,7 +426,11 @@ namespace GeometryTD.UI
             IReadOnlyDictionary<long, BearingCompItemData> bearingMap,
             IReadOnlyDictionary<long, BaseCompItemData> baseMap,
             RepoItemClickActionType clickActionType,
-            bool canDrag)
+            bool canDrag,
+            bool isSellMode,
+            bool isSellable,
+            bool isSellSelected,
+            bool highlightSelected)
         {
             if (tower == null)
             {
@@ -348,6 +444,9 @@ namespace GeometryTD.UI
                 EnduranceRate01 = ItemDescUtility.ResolveTowerEnduranceRate(tower, muzzleMap, bearingMap, baseMap),
                 ClickActionType = clickActionType,
                 ComponentSlotType = TowerCompSlotType.None,
+                IsSellMode = isSellMode,
+                IsSellable = isSellable,
+                IsSellSelected = isSellSelected || highlightSelected,
                 IconAreaContext = new TowerIconAreaContext
                 {
                     Rarity = tower.Rarity,

Assets/GameMain/Scripts/UI/Game/Controller/RepoFormController.cs

@@ -3,6 +3,7 @@ using GeometryTD.CustomEvent;
 using GeometryTD.CustomUtility;
 using GeometryTD.Definition;
 using GameFramework.Event;
+using GeometryTD.CustomComponent;
 using UnityEngine;
 using UnityGameFramework.Runtime;
 
@@ -43,6 +44,9 @@ namespace GeometryTD.UI
             GameEntry.Event.Subscribe(RepoCombineRequestedEventArgs.EventId, OnRepoCombineRequested);
             GameEntry.Event.Subscribe(RepoParticipantAssignRequestedEventArgs.EventId, OnRepoParticipantAssignRequested);
             GameEntry.Event.Subscribe(RepoFormReturnEventArgs.EventId, OnRepoFormReturn);
+            GameEntry.Event.Subscribe(RepoSellModeToggleRequestedEventArgs.EventId, OnRepoSellModeToggleRequested);
+            GameEntry.Event.Subscribe(RepoSellCancelRequestedEventArgs.EventId, OnRepoSellCancelRequested);
+            GameEntry.Event.Subscribe(RepoSellConfirmRequestedEventArgs.EventId, OnRepoSellConfirmRequested);
         }
 
         protected override void UnsubscribeCustomEvents()
@@ -53,6 +57,9 @@ namespace GeometryTD.UI
             GameEntry.Event.Unsubscribe(RepoCombineRequestedEventArgs.EventId, OnRepoCombineRequested);
             GameEntry.Event.Unsubscribe(RepoParticipantAssignRequestedEventArgs.EventId, OnRepoParticipantAssignRequested);
             GameEntry.Event.Unsubscribe(RepoFormReturnEventArgs.EventId, OnRepoFormReturn);
+            GameEntry.Event.Unsubscribe(RepoSellModeToggleRequestedEventArgs.EventId, OnRepoSellModeToggleRequested);
+            GameEntry.Event.Unsubscribe(RepoSellCancelRequestedEventArgs.EventId, OnRepoSellCancelRequested);
+            GameEntry.Event.Unsubscribe(RepoSellConfirmRequestedEventArgs.EventId, OnRepoSellConfirmRequested);
         }
 
         public override int? OpenUI(object userData = null)
@@ -125,6 +132,24 @@ namespace GeometryTD.UI
                 return;
             }
 
+            if (_useCase != null && _useCase.State == RepoFormState.Sell)
+            {
+                if (_useCase.TryToggleSellSelection(
+                        args.ItemId,
+                        out RepoFormRawData sellModeRawData,
+                        out PlayerInventorySaleFailureReason failureReason))
+                {
+                    SetContext(BuildContext(sellModeRawData));
+                    RefreshCurrentUI();
+                }
+                else if (failureReason == PlayerInventorySaleFailureReason.ParticipantTower)
+                {
+                    OpenSellBlockedDialog("参战防御塔不能直接出售，请先移出参战区。");
+                }
+
+                return;
+            }
+
             if (clickActionType == RepoItemClickActionType.RemoveParticipant)
             {
                 if (_useCase == null || Form == null)
@@ -165,6 +190,11 @@ namespace GeometryTD.UI
                 return;
             }
 
+            if (Context != null && Context.State == RepoFormState.Sell)
+            {
+                return;
+            }
+
             if (!(e is RepoItemDragEndedEventArgs args))
             {
                 return;
@@ -188,6 +218,11 @@ namespace GeometryTD.UI
                 return;
             }
 
+            if (Context != null && Context.State == RepoFormState.Sell)
+            {
+                return;
+            }
+
             if (!(e is CombineSlotClickedEventArgs args))
             {
                 return;
@@ -257,6 +292,11 @@ namespace GeometryTD.UI
                 return;
             }
 
+            if (Context != null && Context.State == RepoFormState.Sell)
+            {
+                return;
+            }
+
             if (!(e is RepoParticipantAssignRequestedEventArgs args))
             {
                 return;
@@ -288,6 +328,65 @@ namespace GeometryTD.UI
             RefreshParticipantAreaOnly();
         }
 
+        private void OnRepoSellModeToggleRequested(object sender, GameEventArgs e)
+        {
+            if (!IsEventFromCurrentForm(sender) || !(e is RepoSellModeToggleRequestedEventArgs) || _useCase == null)
+            {
+                return;
+            }
+
+            if (_useCase.State != RepoFormState.Assemble)
+            {
+                return;
+            }
+
+            RepoFormRawData rawData = _useCase.EnterSellState();
+            SetContext(BuildContext(rawData));
+            RefreshCurrentUI();
+        }
+
+        private void OnRepoSellCancelRequested(object sender, GameEventArgs e)
+        {
+            if (!IsEventFromCurrentForm(sender) || !(e is RepoSellCancelRequestedEventArgs) || _useCase == null)
+            {
+                return;
+            }
+
+            if (_useCase.State != RepoFormState.Sell)
+            {
+                return;
+            }
+
+            SetContext(BuildContext(_useCase.ExitSellState()));
+            RefreshCurrentUI();
+        }
+
+        private void OnRepoSellConfirmRequested(object sender, GameEventArgs e)
+        {
+            if (!IsEventFromCurrentForm(sender) || !(e is RepoSellConfirmRequestedEventArgs) || _useCase == null)
+            {
+                return;
+            }
+
+            if (!_useCase.TryConfirmSellSelection(out RepoFormRawData rawData, out PlayerInventorySaleResult result))
+            {
+                if (result != null && result.FailureReason == PlayerInventorySaleFailureReason.ParticipantTower)
+                {
+                    OpenSellBlockedDialog("参战防御塔不能直接出售，请先移出参战区。");
+                }
+
+                return;
+            }
+
+            SetContext(BuildContext(rawData));
+            RefreshCurrentUI();
+
+            if (GameEntry.UI.GetUIForm(UIFormType.ShopForm) != null)
+            {
+                GameEntry.UIRouter.OpenUI(UIFormType.ShopForm);
+            }
+        }
+
         private bool IsEventFromCurrentForm(object sender)
         {
             if (Form == null)
@@ -309,6 +408,18 @@ namespace GeometryTD.UI
             return false;
         }
 
+        private static void OpenSellBlockedDialog(string message)
+        {
+            GameEntry.UIRouter.OpenUI(UIFormType.DialogForm, new DialogFormRawData
+            {
+                Mode = 1,
+                Title = "无法出售",
+                Message = message,
+                PauseGame = false,
+                ConfirmText = "知道了"
+            });
+        }
+
         #endregion
     }
 }

Assets/GameMain/Scripts/UI/Game/RawData/RepoFormRawData.cs

@@ -5,5 +5,9 @@ namespace GeometryTD.UI
     public class RepoFormRawData
     {
         public BackpackInventoryData Inventory;
+        public RepoFormState State;
+        public long[] SelectedSellItemIds;
+        public int SelectedSellItemCount;
+        public int SelectedSellTotalPrice;
     }
 }

Assets/GameMain/Scripts/UI/Game/UseCase/RepoFormUseCase.cs

@@ -1,4 +1,6 @@
-using GeometryTD.CustomUtility;
+using System.Collections.Generic;
+using GeometryTD.CustomComponent;
+using GeometryTD.CustomUtility;
 using GeometryTD.Definition;
 
 namespace GeometryTD.UI
@@ -7,6 +9,8 @@ namespace GeometryTD.UI
     {
         private const int MaxParticipantCount = 4;
         private BackpackInventoryData _fallbackInventory;
+        private readonly HashSet<long> _selectedSellItemIds = new HashSet<long>();
+        private RepoFormState _state = RepoFormState.Assemble;
 
         public RepoFormRawData CreateInitialModel()
         {
@@ -15,12 +19,23 @@ namespace GeometryTD.UI
                 : GetOrCreateFallbackInventory();
             return new RepoFormRawData
             {
-                Inventory = sample
+                Inventory = sample,
+                State = _state,
+                SelectedSellItemIds = BuildSelectedSellItemArray(),
+                SelectedSellItemCount = _selectedSellItemIds.Count,
+                SelectedSellTotalPrice = ResolveSelectedSellTotalPrice()
             };
         }
 
+        public RepoFormState State => _state;
+
         public bool TryAssembleTower(long muzzleItemId, long bearingItemId, long baseItemId)
         {
+            if (_state == RepoFormState.Sell)
+            {
+                return false;
+            }
+
             if (GameEntry.PlayerInventory == null)
             {
                 return false;
@@ -35,6 +50,15 @@ namespace GeometryTD.UI
 
         public ParticipantTowerAssignResult TryAddParticipantTower(long towerItemId)
         {
+            if (_state == RepoFormState.Sell)
+            {
+                return new ParticipantTowerAssignResult
+                {
+                    TowerInstanceId = towerItemId,
+                    FailureReason = ParticipantTowerAssignFailureReason.ParticipantAreaFull
+                };
+            }
+
             if (GameEntry.PlayerInventory == null)
             {
                 BackpackInventoryData fallbackInventory = GetOrCreateFallbackInventory();
@@ -44,11 +68,16 @@ namespace GeometryTD.UI
                     MaxParticipantCount);
             }
 
-            return GameEntry.PlayerInventory.TryAddParticipantTower(towerItemId, 4);
+            return GameEntry.PlayerInventory.TryAddParticipantTower(towerItemId, MaxParticipantCount);
         }
 
         public bool TryRemoveParticipantTower(long towerItemId)
         {
+            if (_state == RepoFormState.Sell)
+            {
+                return false;
+            }
+
             if (GameEntry.PlayerInventory == null)
             {
                 BackpackInventoryData fallbackInventory = GetOrCreateFallbackInventory();
@@ -61,12 +90,120 @@ namespace GeometryTD.UI
             return GameEntry.PlayerInventory.TryRemoveParticipantTower(towerItemId);
         }
 
+        public RepoFormRawData EnterSellState()
+        {
+            _state = RepoFormState.Sell;
+            _selectedSellItemIds.Clear();
+            return CreateInitialModel();
+        }
+
+        public RepoFormRawData ExitSellState()
+        {
+            _state = RepoFormState.Assemble;
+            _selectedSellItemIds.Clear();
+            return CreateInitialModel();
+        }
+
+        public bool TryToggleSellSelection(
+            long itemId,
+            out RepoFormRawData rawData,
+            out PlayerInventorySaleFailureReason failureReason)
+        {
+            rawData = null;
+            failureReason = PlayerInventorySaleFailureReason.None;
+            if (_state != RepoFormState.Sell || itemId <= 0 || GameEntry.PlayerInventory == null)
+            {
+                failureReason = PlayerInventorySaleFailureReason.InvalidSelection;
+                return false;
+            }
+
+            if (_selectedSellItemIds.Contains(itemId))
+            {
+                _selectedSellItemIds.Remove(itemId);
+                rawData = CreateInitialModel();
+                return true;
+            }
+
+            if (!GameEntry.PlayerInventory.TryGetSaleCandidate(itemId, out PlayerInventorySaleCandidate candidate) ||
+                candidate == null)
+            {
+                failureReason = PlayerInventorySaleFailureReason.ItemNotFound;
+                return false;
+            }
+
+            if (!candidate.IsSellable)
+            {
+                failureReason = candidate.FailureReason;
+                return false;
+            }
+
+            _selectedSellItemIds.Add(itemId);
+            rawData = CreateInitialModel();
+            return true;
+        }
+
+        public bool TryConfirmSellSelection(out RepoFormRawData rawData, out PlayerInventorySaleResult result)
+        {
+            rawData = null;
+            result = null;
+            if (_state != RepoFormState.Sell || _selectedSellItemIds.Count <= 0 || GameEntry.PlayerInventory == null)
+            {
+                return false;
+            }
+
+            if (!GameEntry.PlayerInventory.TrySellItems(_selectedSellItemIds, out PlayerInventorySaleResult saleResult) ||
+                saleResult == null ||
+                !saleResult.IsSuccess)
+            {
+                result = saleResult;
+                rawData = CreateInitialModel();
+                return false;
+            }
+
+            _selectedSellItemIds.Clear();
+            result = saleResult;
+            rawData = CreateInitialModel();
+            return true;
+        }
+
         private BackpackInventoryData GetOrCreateFallbackInventory()
         {
             _fallbackInventory ??= InventorySeedUtility.CreateSampleInventory();
             InventoryParticipantUtility.NormalizeParticipantState(_fallbackInventory, MaxParticipantCount);
             return _fallbackInventory;
         }
+
+        private long[] BuildSelectedSellItemArray()
+        {
+            if (_selectedSellItemIds.Count <= 0)
+            {
+                return System.Array.Empty<long>();
+            }
+
+            long[] itemIds = new long[_selectedSellItemIds.Count];
+            _selectedSellItemIds.CopyTo(itemIds);
+            return itemIds;
+        }
+
+        private int ResolveSelectedSellTotalPrice()
+        {
+            if (_state != RepoFormState.Sell || _selectedSellItemIds.Count <= 0 || GameEntry.PlayerInventory == null)
+            {
+                return 0;
+            }
+
+            int total = 0;
+            foreach (long itemId in _selectedSellItemIds)
+            {
+                if (GameEntry.PlayerInventory.TryGetSaleCandidate(itemId, out PlayerInventorySaleCandidate candidate) &&
+                    candidate != null &&
+                    candidate.IsSellable)
+                {
+                    total += candidate.Price;
                 }
             }
 
+            return total;
+        }
+    }
+}

Assets/GameMain/Scripts/UI/Game/View/CombineArea.cs

@@ -8,6 +8,7 @@ namespace GeometryTD.UI
     public class CombineArea : MonoBehaviour, IDropHandler
     {
         [SerializeField] private CombineSlotItem[] _slots;
+        private bool _isInteractionEnabled = true;
 
         public void OnInit(CombineAreaContext context)
         {
@@ -43,6 +44,11 @@ namespace GeometryTD.UI
 
         public void OnCombineClick()
         {
+            if (!_isInteractionEnabled)
+            {
+                return;
+            }
+
             if (!TryGetBoundItemId(TowerCompSlotType.Muzzle, out long muzzleItemId) ||
                 !TryGetBoundItemId(TowerCompSlotType.Bearing, out long bearingItemId) ||
                 !TryGetBoundItemId(TowerCompSlotType.Base, out long baseItemId))
@@ -55,6 +61,11 @@ namespace GeometryTD.UI
 
         public bool TryAssignItem(RepoItemContext itemContext)
         {
+            if (!_isInteractionEnabled)
+            {
+                return false;
+            }
+
             if (itemContext == null || itemContext.ComponentSlotType == TowerCompSlotType.None)
             {
                 return false;
@@ -91,6 +102,11 @@ namespace GeometryTD.UI
 
         public void OnDrop(PointerEventData eventData)
         {
+            if (!_isInteractionEnabled)
+            {
+                return;
+            }
+
             if (eventData == null)
             {
                 return;
@@ -113,6 +129,11 @@ namespace GeometryTD.UI
             dragItem.SetDropResult(assigned);
         }
 
+        public void SetInteractionEnabled(bool enabled)
+        {
+            _isInteractionEnabled = enabled;
+        }
+
         private CombineSlotItem FindSlot(TowerCompSlotType slotType)
         {
             if (_slots == null)

Assets/GameMain/Scripts/UI/Game/View/ParticipantArea.cs

@@ -14,6 +14,7 @@ namespace GeometryTD.UI
         [SerializeField] private Transform _content;
         [SerializeField] private TowerRepoItem _towerItemTemplate;
         [SerializeField] private int _instancePoolCapacity = 8;
+        private bool _isInteractionEnabled = true;
 
         private readonly List<TowerRepoItem> _activeItems = new List<TowerRepoItem>();
         private readonly HashSet<long> _boundItemIds = new HashSet<long>();
@@ -81,6 +82,11 @@ namespace GeometryTD.UI
 
         public bool CanAssign(IRepoDragItemView dragItem)
         {
+            if (!_isInteractionEnabled)
+            {
+                return false;
+            }
+
             if (dragItem == null || dragItem.InstanceId <= 0)
             {
                 return false;
@@ -106,6 +112,11 @@ namespace GeometryTD.UI
 
         public void OnDrop(PointerEventData eventData)
         {
+            if (!_isInteractionEnabled)
+            {
+                return;
+            }
+
             if (eventData == null)
             {
                 return;
@@ -134,6 +145,11 @@ namespace GeometryTD.UI
             GameEntry.Event.Fire(this, RepoParticipantAssignRequestedEventArgs.Create(dragItem.InstanceId));
         }
 
+        public void SetInteractionEnabled(bool enabled)
+        {
+            _isInteractionEnabled = enabled;
+        }
+
         private void EnsurePool()
         {
             if (_itemPool != null)

Assets/GameMain/Scripts/UI/Game/View/RepoForm.cs

@@ -1,6 +1,7 @@
 using GeometryTD.CustomEvent;
 using TMPro;
 using UnityEngine;
+using UnityEngine.UI;
 using UnityGameFramework.Runtime;
 
 namespace GeometryTD.UI
@@ -8,12 +9,12 @@ namespace GeometryTD.UI
     public class RepoForm : UGuiForm
     {
         [SerializeField] private CombineArea _combineArea;
-        
         [SerializeField] private CompArea _compArea;
-        
+        [SerializeField] private SellArea _sellArea;
         [SerializeField] private ParticipantArea _participantArea;
-
         [SerializeField] private TMP_Text _goldText;
+        [SerializeField] private CommonButton _sellModeButton;
+        [SerializeField] private TMP_Text _sellModeButtonText;
 
         public void RefreshUI(RepoFormContext context)
         {
@@ -23,10 +24,25 @@ namespace GeometryTD.UI
             }
 
             RefreshGoldText(context.GoldText);
+            RefreshStateUI(context);
 
             _combineArea?.OnInit(context.CombineAreaContext);
             _compArea?.OnInit(context.CompAreaContext);
+            _sellArea?.OnInit(context.SellAreaContext);
             _participantArea?.OnInit(context.ParticipantAreaContext);
+
+            if (_combineArea != null)
+            {
+                _combineArea.gameObject.SetActive(context.ShowCombineArea);
+                _combineArea.SetInteractionEnabled(context.State == RepoFormState.Assemble);
+            }
+
+            if (_sellArea != null)
+            {
+                _sellArea.gameObject.SetActive(context.ShowSellArea);
+            }
+
+            _participantArea?.SetInteractionEnabled(context.State == RepoFormState.Assemble);
         }
 
         public void RefreshGoldText(string goldText)
@@ -89,6 +105,7 @@ namespace GeometryTD.UI
 
             _combineArea?.OnReset();
             _compArea?.OnReset();
+            _sellArea?.OnReset();
             _participantArea?.OnReset();
             base.OnClose(isShutdown, userData);
         }
@@ -97,5 +114,23 @@ namespace GeometryTD.UI
         {
             GameEntry.Event.Fire(this, RepoFormReturnEventArgs.Create());
         }
+
+        public void OnSellModeButtonClick()
+        {
+            GameEntry.Event.Fire(this, RepoSellModeToggleRequestedEventArgs.Create());
+        }
+
+        private void RefreshStateUI(RepoFormContext context)
+        {
+            if (_sellModeButton != null)
+            {
+                _sellModeButton.gameObject.SetActive(context != null && context.ShowSellModeButton);
+            }
+
+            if (_sellModeButtonText != null)
+            {
+                _sellModeButtonText.text = context?.SellModeButtonText ?? "出售模式";
+            }
+        }
     }
 }

Assets/GameMain/Scripts/UI/Game/View/RepoItem.cs

@@ -13,6 +13,7 @@ namespace GeometryTD.UI
         [SerializeField] private IconArea _iconArea;
 
         private static readonly Color SelectedColor = new Color32(255, 216, 102, 255);
+        private static readonly Color DisabledSellColor = new Color32(96, 96, 96, 255);
         private static readonly Color EmptyEnduranceColor = new Color(0.8f, 0f, 0f, 1f);
         private static readonly Color FullEnduranceColor = new Color(0f, 0.8f, 0f, 1f);
         private static readonly Vector2 DefaultDragGhostSize = new Vector2(64f, 64f);
@@ -72,7 +73,7 @@ namespace GeometryTD.UI
             _context = context;
             _iconArea.OnInit(context.IconAreaContext);
 
-            SetSelected(false);
+            SetSelected(context.IsSellSelected);
             ResetDragState();
         }
 
@@ -104,6 +105,12 @@ namespace GeometryTD.UI
                 return;
             }
 
+            if (_context != null && _context.IsSellMode && !_context.IsSellable)
+            {
+                _bgImage.color = DisabledSellColor;
+                return;
+            }
+
             float enduranceRate = _context != null ? Mathf.Clamp01(_context.EnduranceRate01) : 1f;
             _bgImage.color = Color.Lerp(EmptyEnduranceColor, FullEnduranceColor, enduranceRate);
         }
@@ -212,6 +219,11 @@ namespace GeometryTD.UI
                 return false;
             }
 
+            if (_context.IsSellMode)
+            {
+                return false;
+            }
+
             if (_isSelected && _context.ComponentSlotType != TowerCompSlotType.None)
             {
                 return false;

Assets/GameMain/Scripts/UI/Game/View/SellArea.cs

@@ -0,0 +1,112 @@
+using System.Collections.Generic;
+using GeometryTD.CustomEvent;
+using TMPro;
+using UnityEngine;
+
+namespace GeometryTD.UI
+{
+    public class SellArea : MonoBehaviour
+    {
+        [SerializeField] private Transform _content;
+        [SerializeField] private RepoItem _itemTemplate;
+        [SerializeField] private TowerRepoItem _towerItemTemplate;
+        [SerializeField] private TMP_Text _totalPrice;
+
+        private readonly List<RepoItem> _activeComponentItems = new List<RepoItem>();
+        private readonly List<TowerRepoItem> _activeTowerItems = new List<TowerRepoItem>();
+        private SellAreaContext _context;
+
+        public void OnInit(SellAreaContext context)
+        {
+            OnReset();
+            _context = context;
+
+            if (_totalPrice != null)
+            {
+                _totalPrice.text = context?.TotalPriceText ?? string.Empty;
+            }
+
+            if (context == null || _content == null)
+            {
+                return;
+            }
+
+            if (context.ComponentItems != null)
+            {
+                foreach (RepoItemContext itemContext in context.ComponentItems)
+                {
+                    if (itemContext == null || _itemTemplate == null)
+                    {
+                        continue;
+                    }
+
+                    RepoItem item = Instantiate(_itemTemplate, _content);
+                    item.gameObject.SetActive(true);
+                    item.OnInit(itemContext);
+                    _activeComponentItems.Add(item);
+                }
+            }
+
+            if (context.TowerItems != null)
+            {
+                foreach (TowerRepoItemContext itemContext in context.TowerItems)
+                {
+                    if (itemContext == null || _towerItemTemplate == null)
+                    {
+                        continue;
+                    }
+
+                    TowerRepoItem item = Instantiate(_towerItemTemplate, _content);
+                    item.gameObject.SetActive(true);
+                    item.OnInit(itemContext);
+                    _activeTowerItems.Add(item);
+                }
+            }
+        }
+
+        public void OnReset()
+        {
+            for (int i = _activeComponentItems.Count - 1; i >= 0; i--)
+            {
+                RepoItem item = _activeComponentItems[i];
+                if (item != null)
+                {
+                    Destroy(item.gameObject);
+                }
+            }
+
+            for (int i = _activeTowerItems.Count - 1; i >= 0; i--)
+            {
+                TowerRepoItem item = _activeTowerItems[i];
+                if (item != null)
+                {
+                    Destroy(item.gameObject);
+                }
+            }
+
+            _activeComponentItems.Clear();
+            _activeTowerItems.Clear();
+            _context = null;
+
+            if (_totalPrice != null)
+            {
+                _totalPrice.text = string.Empty;
+            }
+        }
+
+        public void OnCancelButtonClick()
+        {
+            GameEntry.Event.Fire(this, RepoSellCancelRequestedEventArgs.Create());
+        }
+
+        public void OnConfirmButtonClick()
+        {
+            if (_context == null || !_context.CanConfirmSell)
+            {
+                return;
+            }
+
+            GameEntry.Event.Fire(this, RepoSellConfirmRequestedEventArgs.Create());
+        }
+    }
+}

Assets/GameMain/Scripts/UI/Game/View/SellArea.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 548fcad4dc8202f41b67f48aab7bed13
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/GameMain/Scripts/UI/Shop/UseCase/ShopFormUseCase.cs

@@ -61,37 +61,16 @@ namespace GeometryTD.UI
                 return false;
             }
 
-            if (!GameEntry.PlayerInventory.TryConsumeGold(goodsItem.Price))
+            if (!GameEntry.PlayerInventory.TryPurchaseComponent(goodsItem.SourceItem, goodsItem.Price))
             {
-                Log.Warning("ShopFormUseCase.TryPurchase() failed. Not enough gold for goods item {0}.", goodsIndex);
+                Log.Warning("ShopFormUseCase.TryPurchase() failed. Purchase command was rejected for goods item {0}.", goodsIndex);
                 return false;
             }
 
-            BackpackInventoryData inventoryDelta = WrapSingleItem(goodsItem.SourceItem);
-            GameEntry.PlayerInventory.MergeInventory(inventoryDelta);
             goodsItem.IsPurchased = true;
             updatedRawData = CreateInitialModel();
             return true;
         }
 
-        private static BackpackInventoryData WrapSingleItem(TowerCompItemData item)
-        {
-            BackpackInventoryData inventory = new BackpackInventoryData();
-            switch (item)
-            {
-                case MuzzleCompItemData muzzleComp:
-                    inventory.MuzzleComponents.Add(InventoryCloneUtility.CloneMuzzleComp(muzzleComp));
-                    break;
-                case BearingCompItemData bearingComp:
-                    inventory.BearingComponents.Add(InventoryCloneUtility.CloneBearingComp(bearingComp));
-                    break;
-                case BaseCompItemData baseComp:
-                    inventory.BaseComponents.Add(InventoryCloneUtility.CloneBaseComp(baseComp));
-                    break;
-            }
-
-            return inventory;
-        }
-
     }
 }

Assets/GameMain/Scripts/Utility/ShopPriceRuleService.cs

@@ -0,0 +1,122 @@
+using System;
+using System.Collections.Generic;
+using GameFramework.DataTable;
+using GeometryTD.DataTable;
+using GeometryTD.Definition;
+using UnityEngine;
+using Random = System.Random;
+
+namespace GeometryTD.CustomUtility
+{
+    public static class ShopPriceRuleService
+    {
+        public static int ResolveRandomBuyPrice(IReadOnlyList<DRShopPrice> shopPriceRows, RarityType rarity, Random random)
+        {
+            if (!TryFindPriceRow(shopPriceRows, rarity, out DRShopPrice row) || row == null)
+            {
+                return 0;
+            }
+
+            int min = Mathf.Max(0, row.MinPrice);
+            int max = Mathf.Max(min, row.MaxPrice);
+            return random != null ? random.Next(min, max + 1) : min;
+        }
+
+        public static int ResolveComponentSalePrice(TowerCompItemData component, IDataTable<DRShopPrice> shopPriceTable = null)
+        {
+            if (component == null)
+            {
+                return 0;
+            }
+
+            return ResolveBasePrice(component.Rarity, shopPriceTable);
+        }
+
+        public static bool TryResolveTowerSalePrice(
+            TowerItemData tower,
+            BackpackInventoryData inventory,
+            out int price,
+            IDataTable<DRShopPrice> shopPriceTable = null)
+        {
+            price = 0;
+            if (tower == null || inventory == null)
+            {
+                return false;
+            }
+
+            if (!TryGetComponentById(inventory.MuzzleComponents, tower.MuzzleComponentInstanceId, out MuzzleCompItemData muzzleComp) ||
+                !TryGetComponentById(inventory.BearingComponents, tower.BearingComponentInstanceId, out BearingCompItemData bearingComp) ||
+                !TryGetComponentById(inventory.BaseComponents, tower.BaseComponentInstanceId, out BaseCompItemData baseComp))
+            {
+                return false;
+            }
+
+            price = ResolveComponentSalePrice(muzzleComp, shopPriceTable) +
+                    ResolveComponentSalePrice(bearingComp, shopPriceTable) +
+                    ResolveComponentSalePrice(baseComp, shopPriceTable);
+            return price > 0;
+        }
+
+        public static int ResolveBasePrice(RarityType rarity, IDataTable<DRShopPrice> shopPriceTable = null)
+        {
+            IDataTable<DRShopPrice> resolvedTable = shopPriceTable ?? GameEntry.DataTable.GetDataTable<DRShopPrice>();
+            if (resolvedTable == null)
+            {
+                return 0;
+            }
+
+            DRShopPrice[] rows = resolvedTable.GetAllDataRows();
+            if (!TryFindPriceRow(rows, rarity, out DRShopPrice row) || row == null)
+            {
+                return 0;
+            }
+
+            int min = Mathf.Max(0, row.MinPrice);
+            int max = Mathf.Max(min, row.MaxPrice);
+            return Mathf.RoundToInt((min + max) * 0.5f);
+        }
+
+        private static bool TryFindPriceRow(IReadOnlyList<DRShopPrice> rows, RarityType rarity, out DRShopPrice result)
+        {
+            result = null;
+            if (rows == null)
+            {
+                return false;
+            }
+
+            for (int i = 0; i < rows.Count; i++)
+            {
+                DRShopPrice row = rows[i];
+                if (row != null && row.Rarity == rarity)
+                {
+                    result = row;
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
+        private static bool TryGetComponentById<TComp>(IReadOnlyList<TComp> components, long instanceId, out TComp result)
+            where TComp : TowerCompItemData
+        {
+            result = null;
+            if (components == null || instanceId <= 0)
+            {
+                return false;
+            }
+
+            for (int i = 0; i < components.Count; i++)
+            {
+                TComp component = components[i];
+                if (component != null && component.InstanceId == instanceId)
+                {
+                    result = component;
+                    return true;
+                }
+            }
+
+            return false;
+        }
+    }
+}

Assets/GameMain/Scripts/Utility/ShopPriceRuleService.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: b1bcf5c75bea4faaacdb4ffc5adfaf36
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Tests/EditMode/PlayerInventoryTradeServiceTests.cs

@@ -0,0 +1,298 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using GameFramework.DataTable;
+using GeometryTD.CustomComponent;
+using GeometryTD.DataTable;
+using GeometryTD.Definition;
+using NUnit.Framework;
+
+namespace GeometryTD.Tests.EditMode
+{
+    public sealed class PlayerInventoryTradeServiceTests
+    {
+        [Test]
+        public void TrySellItems_Sells_Selected_Component_And_Tower_Atomically()
+        {
+            BackpackInventoryData inventory = CreateInventory();
+            PlayerInventoryState state = new PlayerInventoryState();
+            PlayerInventoryQueryModel queryModel = new PlayerInventoryQueryModel(state);
+            PlayerInventoryCommandModel commandModel = new PlayerInventoryCommandModel(state);
+            commandModel.Initialize(inventory, maxParticipantTowerCount: 4);
+
+            PlayerInventoryTradeService tradeService = new PlayerInventoryTradeService(
+                queryModel,
+                commandModel,
+                CreatePriceTable(
+                    CreateShopPriceRow(1, RarityType.Blue, 30, 34),
+                    CreateShopPriceRow(2, RarityType.Purple, 60, 64)));
+
+            bool success = tradeService.TrySellItems(new long[] { 101, 201 }, out PlayerInventorySaleResult result);
+
+            Assert.That(success, Is.True);
+            Assert.That(result, Is.Not.Null);
+            Assert.That(result.IsSuccess, Is.True);
+            Assert.That(result.SoldComponentCount, Is.EqualTo(1));
+            Assert.That(result.SoldTowerCount, Is.EqualTo(1));
+            Assert.That(queryModel.Inventory.Gold, Is.EqualTo(138));
+            Assert.That(queryModel.Inventory.MuzzleComponents.Exists(item => item.InstanceId == 101), Is.False);
+            Assert.That(queryModel.Inventory.Towers.Exists(item => item.InstanceId == 201), Is.False);
+            Assert.That(queryModel.Inventory.MuzzleComponents.Exists(item => item.InstanceId == 202), Is.False);
+            Assert.That(queryModel.Inventory.BearingComponents.Exists(item => item.InstanceId == 203), Is.False);
+            Assert.That(queryModel.Inventory.BaseComponents.Exists(item => item.InstanceId == 204), Is.False);
+        }
+
+        [Test]
+        public void TryGetSaleCandidate_Rejects_Participant_Tower()
+        {
+            BackpackInventoryData inventory = CreateInventory();
+            inventory.ParticipantTowerInstanceIds.Add(201);
+
+            PlayerInventoryState state = new PlayerInventoryState();
+            PlayerInventoryQueryModel queryModel = new PlayerInventoryQueryModel(state);
+            PlayerInventoryCommandModel commandModel = new PlayerInventoryCommandModel(state);
+            commandModel.Initialize(inventory, maxParticipantTowerCount: 4);
+
+            PlayerInventoryTradeService tradeService = new PlayerInventoryTradeService(
+                queryModel,
+                commandModel,
+                CreatePriceTable(CreateShopPriceRow(1, RarityType.Blue, 30, 34)));
+
+            bool resolved = tradeService.TryGetSaleCandidate(201, out PlayerInventorySaleCandidate candidate);
+
+            Assert.That(resolved, Is.True);
+            Assert.That(candidate, Is.Not.Null);
+            Assert.That(candidate.IsSellable, Is.False);
+            Assert.That(candidate.FailureReason, Is.EqualTo(PlayerInventorySaleFailureReason.ParticipantTower));
+        }
+
+        private static BackpackInventoryData CreateInventory()
+        {
+            BackpackInventoryData inventory = new BackpackInventoryData
+            {
+                Gold = 10
+            };
+
+            inventory.MuzzleComponents.Add(new MuzzleCompItemData
+            {
+                InstanceId = 101,
+                ConfigId = 1,
+                Name = "Loose Muzzle",
+                Rarity = RarityType.Blue,
+                Endurance = 100f,
+                IsAssembledIntoTower = false
+            });
+            inventory.MuzzleComponents.Add(new MuzzleCompItemData
+            {
+                InstanceId = 202,
+                ConfigId = 2,
+                Name = "Tower Muzzle",
+                Rarity = RarityType.Blue,
+                Endurance = 100f,
+                IsAssembledIntoTower = true
+            });
+            inventory.BearingComponents.Add(new BearingCompItemData
+            {
+                InstanceId = 203,
+                ConfigId = 3,
+                Name = "Tower Bearing",
+                Rarity = RarityType.Blue,
+                Endurance = 100f,
+                IsAssembledIntoTower = true
+            });
+            inventory.BaseComponents.Add(new BaseCompItemData
+            {
+                InstanceId = 204,
+                ConfigId = 4,
+                Name = "Tower Base",
+                Rarity = RarityType.Blue,
+                Endurance = 100f,
+                IsAssembledIntoTower = true
+            });
+
+            inventory.Towers.Add(new TowerItemData
+            {
+                InstanceId = 201,
+                Name = "Tower #201",
+                Rarity = RarityType.Blue,
+                MuzzleComponentInstanceId = 202,
+                BearingComponentInstanceId = 203,
+                BaseComponentInstanceId = 204
+            });
+
+            return inventory;
+        }
+
+        private static IDataTable<DRShopPrice> CreatePriceTable(params DRShopPrice[] rows)
+        {
+            return new FakeDataTable<DRShopPrice>(rows);
+        }
+
+        private static DRShopPrice CreateShopPriceRow(int id, RarityType rarity, int minPrice, int maxPrice)
+        {
+            DRShopPrice row = new DRShopPrice();
+            Assert.That(row.ParseDataRow($"\t{id}\t\t{rarity}\t{minPrice}\t{maxPrice}", null), Is.True);
+            return row;
+        }
+
+        private sealed class FakeDataTable<TRow> : IDataTable<TRow> where TRow : class, IDataRow
+        {
+            private readonly Dictionary<int, TRow> _rowsById = new();
+
+            public FakeDataTable(params TRow[] rows)
+            {
+                if (rows == null)
+                {
+                    return;
+                }
+
+                for (int i = 0; i < rows.Length; i++)
+                {
+                    TRow row = rows[i];
+                    if (row != null)
+                    {
+                        _rowsById[row.Id] = row;
+                    }
+                }
+            }
+
+            public string Name => typeof(TRow).Name;
+            public string FullName => typeof(TRow).FullName;
+            public Type Type => typeof(TRow);
+            public int Count => _rowsById.Count;
+            public TRow this[int id] => GetDataRow(id);
+            public TRow MinIdDataRow => null;
+            public TRow MaxIdDataRow => null;
+
+            public bool HasDataRow(int id) => _rowsById.ContainsKey(id);
+            public bool HasDataRow(Predicate<TRow> condition) => GetDataRow(condition) != null;
+            public TRow GetDataRow(int id) => _rowsById.TryGetValue(id, out TRow row) ? row : null;
+
+            public TRow GetDataRow(Predicate<TRow> condition)
+            {
+                foreach (TRow row in _rowsById.Values)
+                {
+                    if (row != null && condition != null && condition(row))
+                    {
+                        return row;
+                    }
+                }
+
+                return null;
+            }
+
+            public TRow[] GetDataRows(Predicate<TRow> condition)
+            {
+                List<TRow> results = new();
+                GetDataRows(condition, results);
+                return results.ToArray();
+            }
+
+            public void GetDataRows(Predicate<TRow> condition, List<TRow> results)
+            {
+                results?.Clear();
+                if (condition == null || results == null)
+                {
+                    return;
+                }
+
+                foreach (TRow row in _rowsById.Values)
+                {
+                    if (row != null && condition(row))
+                    {
+                        results.Add(row);
+                    }
+                }
+            }
+
+            public TRow[] GetDataRows(Comparison<TRow> comparison)
+            {
+                List<TRow> results = new();
+                GetDataRows(comparison, results);
+                return results.ToArray();
+            }
+
+            public void GetDataRows(Comparison<TRow> comparison, List<TRow> results)
+            {
+                results?.Clear();
+                if (results == null)
+                {
+                    return;
+                }
+
+                results.AddRange(_rowsById.Values);
+                if (comparison != null)
+                {
+                    results.Sort(comparison);
+                }
+            }
+
+            public TRow[] GetDataRows(Predicate<TRow> condition, Comparison<TRow> comparison)
+            {
+                List<TRow> results = new();
+                GetDataRows(condition, comparison, results);
+                return results.ToArray();
+            }
+
+            public void GetDataRows(Predicate<TRow> condition, Comparison<TRow> comparison, List<TRow> results)
+            {
+                GetDataRows(condition, results);
+                if (results != null && comparison != null)
+                {
+                    results.Sort(comparison);
+                }
+            }
+
+            public TRow[] GetAllDataRows()
+            {
+                List<TRow> results = new();
+                GetAllDataRows(results);
+                return results.ToArray();
+            }
+
+            public void GetAllDataRows(List<TRow> results)
+            {
+                results?.Clear();
+                if (results == null)
+                {
+                    return;
+                }
+
+                foreach (int id in GetOrderedIds())
+                {
+                    results.Add(_rowsById[id]);
+                }
+            }
+
+            public bool AddDataRow(string dataRowString, object userData) => throw new NotSupportedException();
+            public bool AddDataRow(byte[] dataRowBytes, int startIndex, int length, object userData) => throw new NotSupportedException();
+            public bool RemoveDataRow(int id) => _rowsById.Remove(id);
+
+            public void RemoveAllDataRows()
+            {
+                _rowsById.Clear();
+            }
+
+            public IEnumerator<TRow> GetEnumerator()
+            {
+                foreach (int id in GetOrderedIds())
+                {
+                    yield return _rowsById[id];
+                }
+            }
+
+            IEnumerator IEnumerable.GetEnumerator()
+            {
+                return GetEnumerator();
+            }
+
+            private int[] GetOrderedIds()
+            {
+                int[] ids = new int[_rowsById.Count];
+                _rowsById.Keys.CopyTo(ids, 0);
+                Array.Sort(ids);
+                return ids;
+            }
+        }
+    }
+}

Assets/Tests/EditMode/PlayerInventoryTradeServiceTests.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: eae86223cf354e758fad4be62efd678d
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

docs/CodeX-TODO.md

@@ -90,20 +90,24 @@
     - 三个示例事件在局内都能完整触发、结算、回写状态。
     - 不会出现组件被扣掉但奖励未发、或耐久扣成负值这种半成功状态。
 
-### P1-03 商店节点：购买 / 出售组件
+### P1-03 商店节点购买 + 背包出售组件 / 防御塔
 
-- 核心目标：把当前“仅购买组件”的商店补成完整交易节点。
+- 核心目标：保留商店节点的购买职责，把出售入口迁到背包 `RepoForm`，形成完整交易闭环。
 - 交付物：
     - `Assets/GameMain/Scripts/UI/Shop/`
+    - `Assets/GameMain/Scripts/UI/Game/`
     - `Assets/GameMain/Scripts/CustomComponent/ShopNodeComponent.cs`
-    - 必要时新增 `Assets/GameMain/Scripts/Utility/` 下的交易规则工具
+    - `Assets/GameMain/Scripts/CustomComponent/PlayerInventory/`
 - 具体拆分：
-    - Shop UI 增加玩家库存展示与出售入口，至少支持出售三类组件。
+    - Shop UI 保持“4 个商品 + 购买 + 打开背包”主链，不再承担库存展示与出售交互。
-    - 交易结算统一走一个买卖接口，不要在 UI 层分别修改金币和库存。
+    - Repo UI 增加明确的出售模式入口；进入后可批量选择未组装组件与非参战防御塔，并显示当前选择总价值。
+    - 参战防御塔不能直接出售，必须先从参战区移出；出售整塔时，需要连同其绑定的 3 个组件一起从库存移除。
+    - 交易结算统一走库存域的显式买/卖命令，不要在 UI 层分别修改金币和库存。
     - 商品购买后状态、库存变化、金币变化要同时刷新，不允许 UI 还显示可买但实际已买。
     - 明确商店节点退出条件与节点完成时机，避免出现开店即完成或出售后不回流的问题。
 - 验收补充：
-    - 买卖后库存与金币实时正确更新。
+    - 商店购买、背包出售后库存与金币实时正确更新。
+    - 从商店里打开背包出售后，返回商店时金币显示与商品状态正确刷新。
     - 关闭商店后重新打开同一节点时，商品状态与本节点交易结果一致。
 
 ### P1-04 商店定价规则：买价、半价回收、卖塔 +10%、耐久折价
@@ -114,7 +118,7 @@
     - `Assets/GameMain/Scripts/Entity/` 或库存相关域对象
     - 视需要调整 `Assets/GameMain/DataTables/ShopPrice.txt`
 - 具体拆分：
-    - 抽出统一价格解析入口：基础买价、出售价、塔出售加成、耐久折价都走同一公式服务。
+    - 抽出统一价格解析入口：商店买价、背包组件出售价、背包防御塔出售价、塔出售加成、耐久折价都走同一公式服务。
     - 明确“组件价格”和“整塔价格”关系，不能在 UI 里临时把三组件价格相加后再乘一个魔法数。
     - 明确耐久折价规则：按当前耐久比例折价，还是按损坏阈值分段折价；先写死规则文档，再落代码。
     - 如果 `ShopPrice.txt` 只够表达品质区间，新增字段或新表承载倍率，不要继续在代码里硬编码。